Just got back from vacation and have read through my e-mails. I thought I would share what a friend sent to me.
This link shows a diamond collier/tiara very similar to Princess Mary of Denmark's wedding tiara. http://www.dorotheum.com/uploads/pics/110414Diadem-Collier.jpg Click on photo to enlarge. I think it's a nicer design and more substantial, but the elements are very similar to Mary's.